Removing a butter stain can be quite a bit more tricky than removing other types of stains as most laundry products were meant to remove liquid stains, not solid stains. However, there still is a way to get butter stains out of clothing. I'll show you how.
First you want to use water and a wash cloth to remove as much excess butter as possible. Then get a dull knife or a spoon and use that to get rid of as much as you can as well. Get a stain remover stick, spray or even a gel and apply it for several minutes to the butter stain. this will allow it to completely go through the fabric.
Get some liquid detergent and rub it through the butter stains on the fabric. Once the liquid detergent is applied, allow the garment to sit for about three or five minutes while it does its thing.
Get water as hot as possible, but not so hot that it will damage the fabric and soak the butter stained clothing in it. Allow it to soak until the hot water loses it's heat. Immediately put the butter stained clothing in the washer and then the dryer after it is done soaking and you should be done!
No more butter stain!